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Index: P

.pm files, loading associated files with: 11.1. Using Modules
P (doesn't match property): 15.2. Effects of Character Semantics
p (matches property): 15.2. Effects of Character Semantics
-P (C preprocessor) command-line switch: 19.1.3. Switches
-p (named pipe) file test: 3.10. Named Unary and File Test Operators
-p (print while looping) command-line switch: 19.1.3. Switches
pack: 25.2. Endianness and Number Width
pack function: 29.2.108. pack
template characters for: 29.2.108. pack
unpack function, Unicode characters and: 15.2. Effects of Character Semantics
package declaration: 4.8. Scoped Declarations
10. Packages
29.2.109. package
package variable
wrapping declaration in block scope: 12.8. Managing Class Data
storing class data in: 12.8. Managing Class Data
(see also global variables)
2.5.1. Name Lookups
4.8.1. Scoped Variable Declarations
declaring: 29.2.107. our
threads, no protection in: 17.2.2. Data Access
packages: 1.2.1.4. Simplicities
2.5. Names
2.5. Names
10. Packages
10.2. Autoloading
adding methods to existing: 12.5.2. Accessing Overridden Methods
binding variables to: 29.2.191. untie
bless function arguments: 12.4. Object Construction
blessing objects into: 29.2.7. bless
delimiters for: 10. Packages
identifiers: 10. Packages
importing semantics to: 29.2.192. use
in @ISA array, inheritance through: 12.5.1. Inheritance Through @ISA
methods and subroutines, resolving for: 12.3. Method Invocation
names for: 2.6.4. Or Leave the Quotes Out Entirely
24.3. Programming with Style
quoting: 12.3.4. Package-Quoted Classes
splitting for autoloading: 32.1.17. Module Installation Support
symbol tables, displaying: 20.3.3. Debugger Options
symbol tables for: 10.1. Symbol Tables
tying variables to: 29.2.178. tie
packed sockaddr: 29.2.54. getpeername
pads: 2.5. Names
page numbers: 28.2. Special Variables in Alphabetical Order
pager option (debugger): 20.3.3. Debugger Options
pages: 28.2. Special Variables in Alphabetical Order
PalmPilot, Perl modules for: 22.1. The CPAN modules Directory
paragraph mode: 19.1.3. Switches
28.2. Special Variables in Alphabetical Order
paragraph separator character: 2.2. Molecules
parameters (see arguments)
scalar context, providing for: 1.2.1.1. Singularities
subroutines
changing in place: 6.2.1. Tricks with Parameter Lists
working with: 6.2.1. Tricks with Parameter Lists
parent classes: 12.1. Brief Refresher on Object-Oriented Lingo
parent processes (see processes)
parse trees: 18.1. The Life Cycle of a Perl Program
18.2. Compiling Your Code
internal, keeping: 18.4. Compiler Backends
original, reconstituting and splicing into current parse tree: 18.5.1. The Bytecode Generator
reconstruction of: 18.1. The Life Cycle of a Perl Program
parsing: 21.1. How Perl Works
double-quote interpolation and regular expressions: 5.2. Pattern-Matching Operators
in the Perl compiler: 18.2. Compiling Your Code
text, Perl modules for: 22.1. The CPAN modules Directory
passing by reference: 6.2. Semantics
prototypes declaring function calls as: 8.1. What Is a Reference?
copying @_ values to my list: 6.2.1. Tricks with Parameter Lists
passing references: 6.3. Passing References
passwords: 29.2.164. srand
crypt function and: 29.2.20. crypt
passwd file: 29.2.61. getpwent
Perl modules for: 22.1. The CPAN modules Directory
PATH environment variable: 1.3.1. How to Do It
19.1.3. Switches
19.2. Environment Variables
security and: 23.1.2. Cleaning Up Your Environment
path for library searches, %INC: 28.2. Special Variables in Alphabetical Order
pathnames, module installed on Windows system: 11.1. Using Modules
pattern-binding operator: 1.7. Regular Expressions
pattern space: 28.2. Special Variables in Alphabetical Order
patterns
autosplitting via -a switch: 19.1.3. Switches
debugger, commands for matching: 20.2.5. Locating Code
fancy patterns: 5.10.1. Lookaround Assertions
replacements, changes in Perl versions: 24.1.5. Previous Perl Traps
patterns (and regular expressions): 1.7. Regular Expressions
5. Pattern Matching
29.2.92. m//
(see also m// operator[semi] m?? operator)
alphanumeric metasymbols: 5.3.1. Metasymbol Tables
assertions, defining your own: 5.10.4. Defining Your Own Assertions
assertions in: 5.1. The Regular Expression Bestiary
backreferences: 1.7.4. Backreferences
5.7.1. Capturing
capturing in: 5.7. Capturing and Clustering
character classes: 1.7. Regular Expressions
5.4. Character Classes
characters in: 5.1. The Regular Expression Bestiary
clustering in: 5.7.2. Clustering
conditional interpolation in: 5.10.3.5. Conditional interpolation
controlling matching: 5.9. Staying in Control
Perl flow control, deciding pattern execution: 5.9.1. Letting Perl Do the Work
regex compiler: 5.9.3. The Regex Compiler
extension syntax: 5.3.1. Metasymbol Tables
extensions, lookaround assertions: 5.10.1. Lookaround Assertions
finding duplicate words in paragraphs: 5.2.1. Pattern Modifiers
functions for matching: 29.1. Perl Functions by Category
generated: 5.10.3.1. Generated patterns
greedy matching: 1.7.1. Quantifiers
5.9.4. The Little Engine That /Could(n't)?/
grep function and: 29.2.72. grep
match-time code evaluation: 5.10.3.3. Match-time code evaluation
match-time pattern interpolation: 5.10.3.4. Match-time pattern interpolation
matching
operators for: 1.7. Regular Expressions
5.2. Pattern-Matching Operators
special variables for: 5.2. Pattern-Matching Operators
5.2.3. The s/// Operator (Substitution)
substrings corresponding to subpatterns: 5.2. Pattern-Matching Operators
matching precedence: 5.9.4. The Little Engine That /Could(n't)?/
metacharacters and metasymbols in: 5.3. Metacharacters and Metasymbols
metasymbols in: 5.3.2. Specific Characters
minimal matching: 1.7.2. Minimal Matching
modifiers, cloistering: 5.7.3. Cloistered Pattern Modifiers
modifiers for: 5.2.1. Pattern Modifiers
Perl code, interjecting into: 5.10.3. Programmatic Patterns
positions for matching: 5.6. Positions
programming style for: 5.10.3. Programmatic Patterns
quantifiers in: 5.1. The Regular Expression Bestiary
5.3.1. Metasymbol Tables
5.5. Quantifiers
5.9.4. The Little Engine That /Could(n't)?/
quotes in: 2.6.3. Pick Your Own Quotes
re pragma, altering default behavior of: 32.1.13. Perl Language Extensions and Internals
recursive matching: 5.10.3.4. Match-time pattern interpolation
security concerns: 23.3.2. Code Masquerading as Data
split function: 29.2.161. split
split function and: 5.2. Pattern-Matching Operators
study function: 29.2.166. study
substitution evaluation: 5.10.3.2. Substitution evaluations
terminating delimiter for: 5.2. Pattern-Matching Operators
Unicode properties, matching on: 15.2. Effects of Character Semantics
for untainting data: 23.1.1. Detecting and Laundering Tainted Data
PAUSE: 22.3. Creating CPAN Modules
pausing scripts: 29.2.156. sleep
PDL (Perl Data Language): 22.1. The CPAN modules Directory
performance: 0.1. The Pursuit of Happiness
measuring: 29.2.181. times
Perl programs, efficiency in: 24.2. Efficiency
period (see . (dot))
Perl
C, extending with
XSUB input and output: 21.3.3. XSUB Input and Output
C, using from: 21.3. Extending Perl (Using C from Perl)
creating extensions: 21.3.2. Creating Extensions
external C library functions, using: 21.3.4. Using Functions from an External C Library
XSUBs and XS language: 21.3.1. XS and XSUBs
CPAN (Comprehensive Perl Archive Network): 22. CPAN
embedding in C: 21.4. Embedding Perl (Using Perl from C)
compiling embedded programs: 21.4.1. Compiling Embedded Programs
Perl interpreter, adding to C program: 21.4.2. Adding a Perl Interpreter to Your C Program
Perl stack, manipulating from C: 21.4.5. Fiddling with the Perl Stack from C
Perl statement, evaluating from C: 21.4.4. Evaluating a Perl Statement from C
Perl subroutine, calling from C: 21.4.3. Calling a Perl Subroutine from C
extensions and internals, modules for: 32.1.13. Perl Language Extensions and Internals
location of: 19.1.2. Location of Perl
models to interface or emulate other languages: 22.1. The CPAN modules Directory
programming, common practices: 24. Common Practices
programs, life cycle of: 18.1. The Life Cycle of a Perl Program
special characters in: 1.2.1. Variable Syntax
thread programming in: 17.2. The Thread Model
use of Unicode, caveats on: 15.3. Caution, [ren2bold] Working
Perl Data Language (PDL) module: 9.1.4. Slices
Perl, history of: 27.1. History Made Practical
Perl interpreter: 1.3.1. How to Do It
18.1. The Life Cycle of a Perl Program
-a switch: 19.1.3. Switches
-c switch: 19.1.3. Switches
-d switch: 19.1.3. Switches
20. The Perl Debugger
-e switch: 1.3.1. How to Do It
19.1.3. Switches
-F switch: 19.1.3. Switches
19.1.3. Switches
-h switch: 19.1.3. Switches
-- switch: 19.1.3. Switches
-I switch: 19.1. Command Processing
19.1.3. Switches
-l switch: 19.1.3. Switches
-m switch: 19.1.3. Switches
-n switch: 19.1.3. Switches
-p switch: 19.1.3. Switches
-s switch: 19.1.3. Switches
20. The Perl Debugger
switches: 19.1.3. Switches
-T switch: 19.1.3. Switches
-u switch: 19.1.3. Switches
-v switch: 19.1.3. Switches
-w switch: 1.3.1. How to Do It
19.1.3. Switches
-x switch: 19.1. Command Processing
19.1.3. Switches
-0 switch: 19.1. Command Processing
19.1.3. Switches
perl interpreter program
-a switch: 28.2. Special Variables in Alphabetical Order
-d switch: 20.6. The Perl Profiler
sticky bit: 24.2.1. Time Efficiency
-T switch: 16.5.2. Networking Servers
23.1. Handling Insecure Data
-w switch: 33. Diagnostic Messages
Perl library: 22.2.3. Installing CPAN Modules into the Perl Library
Perl virtual machine: 18.3. Executing Your Code
18.3. Executing Your Code
perlapi manpage: 21.4.4. Evaluating a Perl Statement from C
perlcall manpage: 21.4.5. Fiddling with the Perl Stack from C
perlcc: 28.2. Special Variables in Alphabetical Order
perlcc command: 18.4. Compiler Backends
pbyscript resulting from: 18.5.1. The Bytecode Generator
$PERLDB: 28.2. Special Variables in Alphabetical Order
PERL5DB environment variable: 19.2. Environment Variables
debugger, customizing with: 20.3.2. Customizing with Init Files
PERLDB_OPTS environment variable
AutoTrace option, tracing compile-phase statements: 20.1. Using the Debugger
debugger customization via: 20.3. Debugger Customization
PERL_DEBUG_MSTATS environment variable: 19.2. Environment Variables
PERL_DESTRUCT_LEVEL environment variable: 19.2. Environment Variables
PERL_DESTRUCT_LEVEL variable: 12.6.1. Garbage Collection with DESTROY Methods
perldoc command: 0.4. Online Documentation
11. Modules
debugger invoking: 20.2.7. Miscellaneous Commands
perlembed manpage: 21.4. Embedding Perl (Using Perl from C)
eval_sv function, demonstrating: 21.4.4. Evaluating a Perl Statement from C
perlfork documentation: 16. Interprocess Communication
PERL5LIB environment variable: 19.2. Environment Variables
perllocale manpage: 29.2.82. lc
perlmodinstall manpage: 22.2. Using CPAN Modules
PERL5OPT environment variable: 19.2. Environment Variables
perlport documentation: 16. Interprocess Communication
PERL5SHELL environment variable: 19.2. Environment Variables
Perl/Tk: 24.2.6. User Efficiency
Perl modules for: 22.1. The CPAN modules Directory
$PERL_VERSION: 28.2. Special Variables in Alphabetical Order
28.2. Special Variables in Alphabetical Order
perlwin32 documentation: 16. Interprocess Communication
permissions: 29.2.171. sysopen
29.2.186. umask
file permission operators, interpreting: 3.10. Named Unary and File Test Operators
users, granting limited: 23.1. Handling Insecure Data
persistent data structures, providing via tie: 14.6. Tie Modules on CPAN
persistent Perl interpreter: 21.4. Embedding Perl (Using Perl from C)
pi: 29.2.4. atan2
picture lines: 7. Formats
29.2.41. format
pid (see processes)
PID (process ID): 28.2. Special Variables in Alphabetical Order
pipe function: 29.2.110. pipe
portability of: 25.5. Interprocess Communication (IPC)
pipelines
multistage, for input: 16.3.1. Anonymous Pipes
multistage, for output: 16.3.1. Anonymous Pipes
pipes
closing: 29.2.16. close
double-ended, opening with tied filehandle: 14.4.2. Creative Filehandles
in interprocess communication: 16.3. Pipes
named pipes: 16.3.4. Named Pipes
process talking to itself: 16.3.2. Talking to Yourself
IO::Pipe module: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities
open function, security risks posed by: 23.1.2. Cleaning Up Your Environment
read-only filehandles, opening: 29.2.104. open
plain old documentation (see pod)
pluralities: 1.2.1.2. Pluralities
.pm file extension: 10. Packages
pod
directives: 26.1.2. Pod Directives
embedding in Perl: 2.2. Molecules
format: 26. Plain Old Documentation
modules: 26.2. Pod Translators and Modules
Perl modules for: 22.1. The CPAN modules Directory
translators: 26.1. Pod in a Nutshell
26.2. Pod Translators and Modules
Pod::Checker module: 32.1.16. Documentation Support
Pod::Functions module: 32.1.16. Documentation Support
Pod::Html module: 32.1.16. Documentation Support
Pod::InputObjects module: 32.1.16. Documentation Support
Pod::Man module: 32.1.16. Documentation Support
Pod::Parser module: 32.1.16. Documentation Support
Pod::Select module: 32.1.16. Documentation Support
Pod::Text module: 32.1.16. Documentation Support
Pod::Text::Termcap module: 32.1.16. Documentation Support
Pod::Usage module: 32.1.16. Documentation Support
POE (Perl Object Environment): 22.1. The CPAN modules Directory
poetry in Perl: 27.2. Perl Poetry
pointers: 2.3. Built-in Data Types
references, unable to convert to: 2.6. Scalar Values
to strings: 29.2.108. pack
pointers (C language): 8. References
poll function: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities
polluting your namespace: 11.2.1. Module Privacy and the Exporter
polymorphism: 12.1. Brief Refresher on Object-Oriented Lingo
pop function: 9. Data Structures
29.2.111. pop
POP method: 14.2.1. Array-Tying Methods
popen function (C language): 21.4. Embedding Perl (Using Perl from C)
portability
Perl programs: 25. Portable Perl
of files and filesystems: 25.3. Files and Filesystems
functions, information on: 29.2. Perl Functions in Alphabetical Order
scripts using gethostent function: 29.2.49. gethostent
of signals: 25.4. System Interaction
porting, information on: 16. Interprocess Communication
porting, efficiency of: 24.2.5. Porter Efficiency
name/number translations for: 29.2.64. getservbyname
Perl, to operating systems: 22. CPAN
pos function: 5.6.4. Progressive Matching
5.6.5. Where You Left Off: The G Assertion
29.2.112. pos
positional assertions: 5.6.5. Where You Left Off: The G Assertion
ordering of matching, changing with: 5.8. Alternation
positions: 5.6. Positions
beginnings of strings, matching: 5.6.1. Beginnings: The A and ^ Assertions
ends of strings, matching: 5.6.2. Endings: The z, Z, and $ Assertions
operators switching to character positions: 15.2. Effects of Character Semantics
position just after previous match, specifying: 5.6.5. Where You Left Off: The G Assertion
precedence in pattern matching: 5.9.4. The Little Engine That /Could(n't)?/
substr function, manipulating with: 5.6. Positions
word boundaries, matching: 5.6.3. Boundaries: The b and B Assertions
positive lookahead assertions: 5.9.4. The Little Engine That /Could(n't)?/
5.10.1. Lookaround Assertions
POSIX classes: 5.4. Character Classes
POSIX module: 32.1.7. Operating System Interfaces
getattr function: 29.2.43. getc
getting exported functions and variables with: 11.1. Using Modules
signal blocking with: 16.1.4. Blocking Signals
strftime function: 29.2.88. localtime
POSIX-style character classes: 5.4.4. POSIX-Style Character Classes
possible matches, specifying set of: 5.8. Alternation
post-incremented (post-decremented) variables: 1.5.4. Unary Arithmetic Operators
postincrement and postdecrement operators: 3. Unary and Binary Operators
$POSTMATCH: 28.2. Special Variables in Alphabetical Order
Postscript, Perl modules for: 22.1. The CPAN modules Directory
PPM (Perl Package Manager): 22.2. Using CPAN Modules
22.2. Using CPAN Modules
pragmas: 1.2.1.4. Simplicities
4.7. Global Declarations
4.9. Pragmas
10. Packages
19.1.3. Switches
29.2.192. use
lexically scoped: 4.9. Pragmas
modules and: 11.1. Using Modules
names, capitalization in: 2.5. Names
use charnames: 2.6.2. String Literals
pre-extending arrays: 24.2.1. Time Efficiency
pre-incremented (pre-decremented) variables: 1.5.4. Unary Arithmetic Operators
precedence: 29. Functions
diagnostic messages: 33. Diagnostic Messages
key/value pair (hashes): 2.9. Hashes
logical operators: 1.5.5. Logical Operators
3.20. Logical and, or, not, and xor
12.3.3. Syntactic Snafus with Indirect Objects
modifiers vs. commas: 4.8.1. Scoped Variable Declarations
operator, table of: 3. Unary and Binary Operators
Perl versions, changes in: 24.1.5. Previous Perl Traps
regular expression matching: 5.9.4. The Little Engine That /Could(n't)?/
unary operators, higher than binary: 3.10. Named Unary and File Test Operators
predeclaring subroutines: 12.5.4. Method Autoloading
32.1.13. Perl Language Extensions and Internals
prefix operators: 1.5. Operators
3. Unary and Binary Operators
metacharacters working as: 5.3. Metacharacters and Metasymbols
$PREMATCH: 28.2. Special Variables in Alphabetical Order
prepending, directories to @INC: 19.1.3. Switches
prepending elements to arrays: 29.2.190. unshift
preprocessing Perl: 24.5.2. Generating Perl in Other Languages
print function: 1.4. Filehandles
1.8. List Processing
24.2.1. Time Efficiency
24.2.1. Time Efficiency
29.2.113. print
implementing to tied filehandle: 14.4.1. Filehandle-Tying Methods
print statements, comma error in: 24.1.1. Universal Blunders
printf function: 3.16. Conditional Operator
24.2.1. Time Efficiency
29.2.114. printf
29.2.162. sprintf
using on tied filehandle: 14.4.1. Filehandle-Tying Methods
printing
arrays of hashes: 9.3.3. Access and Printing of an Array of Hashes
hashes of arrays: 9.2.3. Access and Printing of a Hash of Arrays
multidimensional arrays: 9.1.3. Access and Printing
9.2. Hashes of Arrays
9.4. Hashes of Hashes
multidimensional hashes: 9.4.3. Access and Printing of a Hash of Hashes
9.6.1. Composition, Access, and Printing of More Elaborate Records
nested data structures: 20.2.4. Display
typeglob contents: 20.3.3. Debugger Options
PrintRet option (debugger): 20.3.3. Debugger Options
priority, process: 29.2.57. getpriority
29.2.147. setpriority
privacy: 12.1. Brief Refresher on Object-Oriented Lingo
Perl modules and: 11.2.1. Module Privacy and the Exporter
private methods, ignoring inheritance with: 12.5.5. Private Methods
private objects, closures, using for: 12.7.5. Using Closures for Private Objects
private variables (see local variables)
procedureal programming style: 5.10.3. Programmatic Patterns
procedures: 1.2.2. Verbs
process groups: 16.1. Signals
29.2.55. getpgrp
29.2.146. setpgrp
process ID (pid)
getting process group from: 29.2.55. getpgrp
returning: 29.2.56. getppid
returning with fork: 29.2.40. fork
waitpid function: 29.2.197. waitpid
processes
checking for existence: 16.1.1. Signaling Process Groups
fork function: 29.2.40. fork
functions dealing with: 29.1. Perl Functions by Category
getting group for: 29.2.146. setpgrp
ID (pid): 29.2.104. open
interprocess communication: 16. Interprocess Communication
between processes on same machine: 16. Interprocess Communication
files: 16.2. Files
on the Internet: 16. Interprocess Communication
sockets: 16.5. Sockets
System V IPC: 16.4. System V IPC
killing: 29.2.80. kill
multitasking environments, CPU access: 23.2. Handling Timing Glitches
priority, setting: 29.2.147. setpriority
process model, threads: 17.1. The Process Model
returning priority of: 29.2.57. getpriority
signaling process groups: 16.1.1. Signaling Process Groups
standard input, output, and error in: 1.4. Filehandles
umask for: 29.2.186. umask
variables for: 28.2. Special Variables in Alphabetical Order
waiting for: 29.2.196. wait
zombie: 16.1.2. Reaping Zombies
$PROCESS_ID: 28.2. Special Variables in Alphabetical Order
processing shell commands: 19.1. Command Processing
processor (see CPU)
profiler, Perl: 20.6. The Perl Profiler
profiling, Devel::DProf module: 32.1.13. Perl Language Extensions and Internals
program arguments, shell vs. Perl: 24.1.4. Shell Traps
program name
of perl executable: 28.2. Special Variables in Alphabetical Order
of perl script: 28.2. Special Variables in Alphabetical Order
programming languages, Perl modules for interfacing with or emulating: 22.1. The CPAN modules Directory
programming, Perl: 24. Common Practices
common mistakes by novices, Perl traps, previous versions: 24.1.5. Previous Perl Traps
common mistakes of novices: 24.1. Common Goofs for Novices
efficiency: 24.2. Efficiency
file-manipulating programs, writing portable: 25.3. Files and Filesystems
fluent: 24.4. Fluent Perl
portability: 25. Portable Perl
program generation: 24.5. Program Generation
generating Perl in other languages: 24.5.2. Generating Perl in Other Languages
program generators
other languages in Perl: 24.5.1. Generating Other Languages in Perl
source filters: 24.5.3. Source Filters
programming with style: 24.3. Programming with Style
programming style, patterns: 5.10.3. Programmatic Patterns
$PROGRAM_NAME: 28.2. Special Variables in Alphabetical Order
programs
controlling debugger from: 20.1. Using the Debugger
core dump of: 29.2.29. dump
executing: 29.2.174. system
exiting: 1.1. Getting Started
29.2.35. exit
stepping through with debugger: 20.2.1. Stepping and Running
progressive matching: 5.6.5. Where You Left Off: The G Assertion
projects, large, benefits of strict pragma in: 1.2.1.4. Simplicities
properties: 12.4.2. Initializers
case, Unicode: 15.2. Effects of Character Semantics
Unicode: 5.4. Character Classes
Unicode database of: 15.2. Effects of Character Semantics
protocols, name/number translations: 29.2.58. getprotobyname
prototypes: 6.4. Prototypes
& (ampersand), omitting from subroutine names: 6.4. Prototypes
built-in functions, emulating: 6.4. Prototypes
careful use of: 6.4.2. Care with Prototypes
closures, giving to: 8.3.7.1. Closures as function templates
implicit pass-by-reference in: 8.1. What Is a Reference?
inlining constant functions: 6.4.1. Inlining Constant Functions
prototyping: 6.4. Prototypes
pseudo-operators, overloading and: 13.3. Overloadable Operators
pseudocommands, piping: 16.3.2. Talking to Yourself
pseudohashes: 8.3.5. Pseudohashes
implementing classes with: 29.2.99. my
inheritance and: 12.7.1. Field Declarations with use fields
simulating with overload function: 13.3. Overloadable Operators
use fields pragma, using with: 12.7.1. Field Declarations with use fields
pseudoliterals (see input operators)
punctuation characters, word boundary matching and: 5.6.3. Boundaries: The b and B Assertions
punctuation variables, English module, handling with: 32.1.13. Perl Language Extensions and Internals
push function: 9. Data Structures
29.2.116. push
pop function: 2.3. Built-in Data Types
push-pop (PP) codes: 18.3. Executing Your Code
PV (internal string value): 21.2. Internal Data Types
pwd command (Unix): 24.2.1. Time Efficiency
Python: 2.2. Molecules

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